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First off, the CA18 isn't very common in the US at all, and the ones that are here don't run 400+ HP. (Some may, but not many) I can tell you by looking at your set up and the amount of boost you're planning on running that you'll be out of injector very easily. 2.0 liter motors run 750cc or more to make 400+ HP, I'd imagine you'd want to have a safety zone built in, so I'd reccommend at least 750cc injectors, if not more. Probably 850cc's so you have room to grow if need be.
And yes, you will want a 3-inch (76-80 mm) full exhaust. 2.5 just won't cut it.
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